Feature:
● These tubes are made of medical grade polypropylene; can be repeatedly frozen and thawed
● Multiple threads of lab tubes for super sealing performance
● Thickened tube wall (explosion proof) and cap for safe sample storage
● External thread vials’ caps lack o-rings, which reduces the possibility of contamination
● Clear vials with black graduation printing and white writing area
● DNase & RNase free, endotoxin-free, foreign DNA free
● Gamma radiation sterilized; autoclavable
● Working temperature: stable from -196°C to 121°C
● Suitable for liquid nitrogen freezing (vapor phase)